Improvement of radiation efficiency of the wideband terahertz-emitter using the spintronics device

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04599
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: University of Fukui
• Principal Investigator: Kitahara Hideaki 福井大学, 遠赤外領域開発研究センター, 特命助教 (20397649)
• Co-Investigator(Kenkyū-buntansha): 谷 正彦 福井大学, 遠赤外領域開発研究センター, 教授 (00346181) ; 郭 其新 佐賀大学, シンクロトロン光応用研究センター, 教授 (60243995) ; 中嶋 誠 大阪大学, レーザー科学研究所, 准教授 (40361662)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: スピントロニクスエミッタ / テラヘルツ時間領域分光法

Outline of Final Research Achievements

In order to improve the radiation and detection efficiency of spintronics device, (a) we improved the radiation efficiency by adding an antenna structure electrode, and (b) we improved the detection efficiency by introducing an AC magnetic field bias, attempting to improve the dynamic range by more than one order of magnitude overall. By introducing a rectangular dipole antenna structure and an electromagnetic coil, we achieved an 8-fold and 2-fold improvement in radiation detection efficiency, respectively, compared to a spintronics device without an antenna structure. When both were combined, the efficiency becomes 16 times, achieving the target efficiency improvement of more than 10 times. In addition, using the above results, we also determined the magnetic field saturation characteristics of the device by using the antenna module developed in (b) and developed an emitter that can freely change the polarization orientation.

Free Research Field

テラヘルツ時間領域分光法

Academic Significance and Societal Importance of the Research Achievements

学術的意義としては交流磁場バイアスを使用し、小さな磁場領域に於ける磁場放射特性を計測することで2mTでほぼ飽和するという磁場飽和特性を計測したことにある。
社会的意義としては他の方法と比較して放射パワーが小さいスピントロニクス素子の放射パワーを他の方法に近づけたことにより、ダイナミックレンジが4.5桁と改善し本素子を実使用可能なレベルへ改良することに成功した。